Abstract
The present study establishes hyperfine field systematics at the non-magnetic sites in Heusler alloys and emphasizes the effect of local screening on the hyperfine field value. A range of Heusler alloy hosts were doped with 1 at.% of the isotope 119Sn for examination using the Mossbauer effect. The results reported indicate that the hyperfine field at a given site is strongly dependent in magnitude and sign on the magnetic character of the local screening charge. The fields at Sb sites in several alloys have been measured using the Mossbauer isotope 121Sb and at a Cd impurity site in Ni2MnIn using the method of time-differential perturbed angular correlations. The Sn site fields have been measured in the Co based alloys Co2TiSn, Co2ZrSn and Co2HfSn. The similarity of the values obtained is interpreted in terms of the similar outer electron structure of these alloys.
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